Armature-winding coil for dynamo-electric machines.



Jf D. FORRER.

ARMATURE WINDING COIL FOR DYNAMO ELEOTRIG MACHINES.

I APPLIUATION FILED SEPT. 8, 1908. 957,877.

ATTORNEY Patented May 17, 1910.

UNITED stra rnsrntrnnr orrron.

JOSEPH D. FORRER, OF PI'ITSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, OF EAST PITTSBURG, PENNSYLVANXA, A CURPORATIGN OF PENNSYLVANIA.

Specification of Letters Patent.

Patented May 17, 191.0.

Application filed September 8, 1908. Serial No. 452,088.

ence to the coils of the so-called diamond type which are adapted to form parts of the Wave windings of commutator type machines.

The object of my invention is to provide an improved coil of the class above indicated that shall be relatively easy to wind and assemble in the usual core slots of motor armatures, and especially economical of space.

When direct current electric motors and generators and other dynamo-electric machines having comn'iutatorsare provided with complete wave windings having coils of the diamondtype, the end connecting portions of the assembled coils are close together and form two laycrs',. one within the other.

In order to enable the adjacent coils in a complete winding to fit together closely, the end portions of each coil are usually provided with an oft-set bend, at which point the conductors of which the coil is wound are bent through an angle of substantially 180, being thus completely turned over.

According to my present invention, I twist the bundle of conductors at the offset bends, above rei'erred to, through an angle of substantially 90 so that, it the conductors in one slot are arranged in :1: layers of y conductors each, in the other slot they will be arranged in y layers of conductors each.

Various advantages may be secured by properly proportioning the coil, as will be more specifically pointed out hereinafter.

Figure 1 of the accompanying drawings is a perspective View of an armature coil constructed and formed in accordance with my invention, Fig. 2 is a plan view of the coil shown in Fig. 1, and Fig. 3 is an end elevation of a portion of a dynamo-electric machine provided with several coils which are similar to those in Figs. 1 and 2.

Referring to thedrawings, the armature coil illustrated in Fig. 1 consists of two substantially parallel straight portions 1 and 2 which are adapted to be included in the usual core slots 3 of a dynamo-electric machine, a portion 4 of which is shown in Fig. 3, end connecting portions 5 and (i and loads T and S. The straight portion 2 is adapted to be inserted in the bottom of one of the core slots 3 and, as illustrated in the drawing, it consists of four layers of three conductors each. This relation obtains in that portion of the end connecting member 5 which is adjacent to the said portion 2, the corresponding portion or end connectmg member (3 consisting of four layers of two conductors each. Uff-set bends 9 and 10 are provided substantially in the middle of the end portions at which the bundles of conductors are twisted through an angle of approximately 90, so that the said portion 1 is adapted to be inserted in the top of one of the slots 3 and consists of three layers of four conductors each. If the bundle of conductors were twisted through an angle of substantially 180, as has been usual in the prior art, the off-set bends, and consequently the end coniuacting portions, would occupy a materially greater space in the assembled device.

lVhile the coil illustrated is provided with twelve conductors, as above indicated, it will, of course, be understood that my invention is not restricted to this number of conductors or arrangement of layers, the arrangement illustrated being chosen as best adapted to clearly illustrate the novel features of the invention.

As shown in F 3 of: the drawings, in the bottom of the slots 3 where the conductors are arranged in layers of three conductors each, the required width of slot is less than at the top of the slot in which the conductors are arranged in layers of tour conductors each. A material advantage is gained by this means, particularly in the substantially cylindrical core members of such dynaiIto-electric machines as railway motors and tliclilze, for the reason that the walls oi the slots are preferably parallel to each other and, consequently, unless the inner half of the slots is made narrower, as

shown in Fig: 3 of the drawings, the teeth, 2. 0., the core portions between the slots, are reduced in cross section at the bottom, thereby tending to cause a magnetic saturation of these parts. If the bottom of the slot is considered to be of normal width the top of the slot is relatively enlarged, thereby decreasing the self-induction ot' the winding.

The advantages effected by the reduction in the space required at the ends of the coils may, of-course, be obtained with slots of uniform width, having parallel side Walls, by arranging the conductors in such a Way that the number of layers and the number of conductors per layer, are equal to each other.

For the sake of simplicity in the drawinns I a square conductor is illustrated but it Wlll,

of course, be understood that conductors of other cross section, either circular or reetangular, may be employed with equal fa cility.

I claim as my invention:

1. A coil for dynamo-electric machines comprising a plurality of multi-strand turns having two sul'istantially parallel straight portioi'is, the strands of said turns bein located in one plane inone of the said portions and in another plane substantially perpendicular to the first in the other straight portion.

2. A coil for dynamo-electric machines comprising a plurality of multi strand turns having substantially parallel. straight portions and i-shaped end connecting portions, the conductors being disposed in m layers of comprising a plurality ofmulti-strand turns havmg substantially parallel s raight portions, V -shaped end connecting portions and elf-set bends in said end connecting portions, the strands being twisted through an angle of approximately 90 at the oil-set bends.

A coil for dynarndelectric machines comprising a plurality of multi-strand turns having two substantially parallel straight portions adapted to be included in the core slots of a dynamoelectric machine, the strands of said turns being disposed in radial layers in one straightportion and in tangential layers in the other straight portion.

5. In a dynamo-electric machine, the combination with a substantially cylindrical core member having a plurality of longitudinal. slots in radial planes, of a coil comprising multi-strand turns, having two par-- allel straight portions disposed within pre determined core slots, the strands of said turns being disposed in. radial planes in one slot and in tangential planes in the other slot.

In testimony whereof, I have hereunto subscribed my name this 31st day of August, 1908.

JOSEBH D. FOR-HER v fitnesses J. E. .Vnnsrsn, BInNnY HINES. 

